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| Patents for William Porteous | |||||
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| Number | Date | Patentee | Title | Type | |
| 427,902 | May 13, 1890 | W. Porteous | Lathe Tool | lathe tool holders and tool posts | |
| 427,903 | May 13, 1890 | W. Porteous | Automatic Screw Cutting Die | tap and die holders | |